Electrical Specifications

Fig 1: Identifying Engine Control Module (ECM) I/O Signal Connector Terminals

Courtesy of SUBARU OF AMERICA, INC.

ENGINE CONTROL MODULE (ECM) I/O SIGNAL SPECIFICATIONS

Content		Terminal No.	Measuring conditions and I/O signals (ignition switch ON and engine idling)
Clutch switch		A1	Battery voltage is present when the clutch pedal is released. "0" volt is present when the clutch pedal is depressed.
Cruise indicator light		A15	Battery voltage is present when the main switch is turned to OFF. "0" volt is present when the main switch is turned to ON.
Main power supply	VB (CONTROL 1) VB (CONTROL 2)	B6 B5	Battery voltage is present when the main switch is turned to ON. "0" volt is present when the main switch is turned to OFF.
Vehicle speed signal		B27	Lift-up the vehicle until all four wheels are raised off the ground, and then rotate any wheel manually. Approx. "5 V" and "0 V" pulse signals are alternately input to ECM.
SET/COAST switch		C11	Battery voltage is present when the command switch is turned to SET/COAST position. "0" volt is present when the command switch is released.
RESUME/ACCEL switch		C10	Battery voltage is present when the command switch is turned to RESUME/ACCEL position. "0" volt is present when the command switch is released.
Brake switch 1 (Brake switch)		C9	Battery voltage is present when the brake pedal is released. "0" volt is present when the brake pedal is depressed.
Brake switch 2 (Stop light switch)		C8	Battery voltage is present when the brake pedal is depressed. "0" volt is present when the brake pedal is released.
Main switch		C7	Battery voltage is present while the main switch is depressed or is turned to ON. "0" volt is present when the main switch is turned to OFF.
Ground	GND (CONTROL 1) GND (CONTROL 2)	D2 D1	-
Ignition switch		D15	Battery voltage is present with the ignition switch is turned to ON. "0" volt is present when the ignition switch is turned to OFF.
Neutral switch (MT model)		D9	Battery voltage is present when the shift lever is in anywhere except neutral position. "0" volt is present when the shift lever is in neutral position.
Neutral switch (AT model)		D9	"0" volt is present when the shift lever is in anywhere except N or P position. "5" volt is present when the shift lever is in N or P position.